gdb: change type of quit_flag to bool

Change-Id: I7dc5189ee172e82ef5b2c4a739c011f43a84258b
Approved-By: Tom Tromey <tom@tromey.com>

gdb/event-top.c

@@ -1113,7 +1113,7 @@ handle_sigint (int sig)
 
   /* We could be running in a loop reading in symfiles or something so
      it may be quite a while before we get back to the event loop.  So
-     set quit_flag to 1 here.  Then if QUIT is called before we get to
+     set quit_flag to true here.  Then if QUIT is called before we get to
      the event loop, we will unwind as expected.  */
   set_quit_flag ();
 
@@ -1193,7 +1193,7 @@ handle_sigterm (int sig)
 void
 async_request_quit (gdb_client_data arg)
 {
-  /* If the quit_flag has gotten reset back to 0 by the time we get
+  /* If the quit_flag has gotten reset back to false by the time we get
      back here, that means that an exception was thrown to unwind the
      current command before we got back to the event loop.  So there
      is no reason to call quit again here.  */

gdb/extension.c

@@ -663,7 +663,7 @@ static std::recursive_mutex ext_lang_mutex;
 /* This flag tracks quit requests when we haven't called out to an
    extension language.  it also holds quit requests when we transition to
    an extension language that doesn't have cooperative SIGINT handling.  */
-static int quit_flag;
+static bool quit_flag;
 
 /* The current extension language we've called out to, or
    extension_language_gdb if there isn't one.
@@ -877,7 +877,7 @@ set_quit_flag ()
     active_ext_lang->ops->set_quit_flag (active_ext_lang);
   else
     {
-      quit_flag = 1;
+      quit_flag = true;
 
       /* Now wake up the event loop, or any interruptible_select.  Do
 	 this after setting the flag, because signals on Windows
@@ -914,7 +914,7 @@ check_quit_flag ()
 	 interruptible_select.  The caller handles the quit
 	 request.  */
       quit_serial_event_clear ();
-      quit_flag = 0;
+      quit_flag = false;
       result = true;
     }